<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>my css2</title>
    <style>
        .c1 {
            width: 500px;
            border: 1px dotted purple;
        }
        img {
            width: 100%;
            visibility: hidden;
        }
        .c1:hover img {
            visibility: visible;
        }
        .c2 {
            font-size: 20px;
        }
        html {
            font-size: 20px;
        }
        .c3 {
            font-size: 2rem;
        }
        .c4 {
            font-size: 2em;
            color: purple;
        }
        .c5 {
            color: rgb(150, 150, 0);
        }
        .c6 {
            background-color: #55abc9;
            /*color: #ee5511;*/
            /*color: #E51;*/
            color: #0980a3;
        }
        .c7 { font-size: 30px; }
        .cl1 { color: #2d85f0; }
        .cl2 { color: #f4433c; }
        .cl3 { color: #ffbc32; }
        .cl4 { color: #0aa858; }
    </style>
</head>
<body>
<div class="c7">
    <span class="cl1">G</span>
    <span class="cl2">o</span>
    <span class="cl3">o</span>
    <span class="cl1">g</span>
    <span class="cl4">l</span>
    <span class="cl2">e</span>
</div>
<div class="c5">达内云计算 cloud computing</div>
<div class="c6">达内云计算 cloud computing</div>
<div class="c3">
    达内云计算 cloud computing
    <div class="c4">
        达内云计算 cloud computing
    </div>
</div>
<div class="c2">
    达内云计算 cloud computing
</div>
<div class="c1">
    <img src="http://pic1.win4000.com/wallpaper/b/58ca58d35d719.jpg">
</div>
</body>
</html>